Hi,
I am learning the MPLS, here is the thing which is continusely confusing me. What I read is that the MPLS is far far better technique than the traditional IP routing because you dont have to look for the IP address and search in routing table and then the send the frame in the specified direction. Now here is the scenerio that confuses me a lot.
Lets suppose we are dealing with the MPLS domain.
MPLS Scenerio
Provider Edge Router Receives the packet without Label, and on the basis of destination address it will first assign the Label on that and forward it to the suitable interface, the other router will look for the label and then send it to the suitable interface. Now what is going on here packet received and then labels are searched in the suitable place lets suppose the label table and then assign the specific label on the packet and forward it to the specific interface.
Routing Table and IP scenerio
The packet comes and look for the destination IP address, if matched and then forward it to the interface assigned to that destination IP even no need to swap the IP address and assigned.
Now my question is that how the MPLS is technique is faster way of delivering the packets as the processor needs to do extra amount of work swapping and searching for suitable label (whcih is actually the same as for the routing table, search for the destination IP address) and extra work to remove or add the label??
Thanks and Regards,
Usman
